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ACCOUNTS RECEIVABLE, NET
 12 Months Ended
Dec. 31, 2013
Receivables [Abstract]  
ACCOUNTS RECEIVABLE, NET
4. ACCOUNTS RECEIVABLE, NET

Accounts receivable and allowance for doubtful accounts consist of the following:

 

     December 31,  
     2012     2013  
     RMB     RMB     US$  

Accounts receivable

      327,232        466,965        77,137   

Allowance for doubtful accounts

      (1,161 )      (1,253 )      (207 ) 
  

 

 

    

 

 

    

 

 

  

Total

      326,071        465,712        76,930   
  

 

 

    

 

 

    

 

 

  

As of December 31, 2012 and 2013, all accounts receivable were due from third party customers.

An analysis of the allowance for doubtful accounts is as follows:

 

     December 31,  
     2012      2013  
     RMB      RMB     US$  

Beginning balance

      371         1,161        192   

Additions charged to bad debt expense

      790         251        41   

Write off

      —           (159 )      (26 ) 
  

 

 

     

 

 

    

 

 

  

Ending balance

      1,161         1,253        207   
  

 

 

     

 

 

    

 

 

  

The Group recognized additions to allowance for doubtful accounts related to continuing operations amounting to RMB206, RMB790 and RMB251 (US$41) within general and administrative expenses, for the years ended December 31, 2011, 2012 and 2013, respectively.